- the practice of going nude, especially in places that allow sexually mixed groups, in the belief that such practice benefits health.
- the practice of nudity, esp for reasons of health, religion, etc
n.1929, from French nudisme (see nude + -ism). Nudist “one who practices nudism” appeared at the same time. Made in Germany, imported to France, is the cult of Nudism, a mulligan stew of vegetarianism, physical culture and pagan worship. [“Time,” July 1, 1929]